UK checklist + examples
How to Create a Professional Invoice and Quote in the UK
Start with the details your document needs, then make the total, scope, due date and next action impossible to miss. Use this practical checklist for a clear invoice or client-ready quote.
Experi Free includes 5 invoices, 5 quotes and up to 3 clients. PDFs and printing are included; custom branding and automatic reminders are Pro features.
Short answer
A professional invoice is complete, easy to check and easy to pay. Put the parties, dates, invoice number and total near the top; describe each charge plainly; then give one clear due date and one clear payment route. A professional quote does the same for proposed work, while also defining scope, exclusions, validity and acceptance.
Professional invoice checklist: required first, helpful second
GOV.UK separates the information an invoice must contain from the extra details that help a customer approve and pay it. Start with the required core, then add the practical payment details.
1. Core UK invoice details
- A unique invoice number, plus the invoice date and supply date
- Your business name, address and contact details
- The customer name and address
- A clear, itemised description of the goods or services
- Amounts charged, VAT where applicable, and the total owed
Sole traders, limited companies and VAT-registered businesses have additional identity or VAT requirements. Check the current GOV.UK list (opens in a new tab).
2. Details that make payment easier
- A clear due date and the payment terms agreed with the customer
- How to pay, including the payment reference to use
- A purchase order or job reference when the customer needs one
- A named contact for invoice questions
If no payment date is agreed, GOV.UK says payment is generally due within 30 days of the invoice or the goods or service, whichever is later.
Invoice numbering: avoid the common overclaim
General UK invoices need a unique identification number. VAT invoices require a sequential number from one or more series that uniquely identifies the document. That is more precise than saying every invoice must have a single gap-free sequence.
Quote vs invoice: use each document for a different job
A quote helps a customer decide whether to proceed. An invoice tells them what is now payable. Keep the accepted quote and any approved changes so the invoice can be reconciled without guesswork.
Quote
- When
- Before work or a paid milestone is agreed
- Purpose
- Propose scope, price and terms
- Next action
- Accept, decline or request a change
Invoice
- When
- After supply or at an agreed billing point
- Purpose
- Request payment for supplied work
- Next action
- Approve and pay by the due date
What to include in a professional quote
A quote is strongest when it removes ambiguity before the work starts. Make the deliverable and the route to approval as clear as the price.
- Your details and the customer contact
- A quote number, issue date and validity date
- The exact scope, deliverables and exclusions
- Itemised quantities, prices, VAT where applicable, and the total
- Payment schedule, deposit, change and cancellation terms
- A clear way for the customer to accept or ask a question
Example scope line
“Homepage redesign including responsive layouts and two revision rounds. Copywriting, hosting and additional pages are excluded and will be quoted separately.”
How to create quotes and invoices faster
- Agree the job. Record scope, exclusions, price, VAT treatment and acceptance terms in the quote.
- Keep the accepted version. Save the quote and any written changes so there is one agreed baseline.
- Convert instead of retyping. Carry the customer, descriptions, quantities and prices into an invoice draft.
- Review the invoice-only details. Add the unique invoice number, invoice and supply dates, due date, VAT detail and payment route.
- Check before issuing. Confirm the recipient, purchase-order reference, totals and final PDF, then keep a copy in your records.
Quote to invoice without duplicate typing
Carry the agreed job into an invoice draft
Experi can copy the customer, line items and prices from a quote into a linked invoice. Review any changes before you issue it. Quote and invoice creation, PDF generation and printing are available on Free within the published plan limits.
Make the document look professional
Lead with the document type
Put “Invoice” or “Quote” near the top so it cannot be confused with a receipt, order or credit note.
Build a clear reading order
Group supplier and customer details, then dates and references, line items, totals, and the payment or acceptance action.
Use branding with restraint
Keep colours, logo placement and typography consistent. Custom logo and colour controls in Experi are a Pro feature.
Send a stable final copy
A PDF keeps the issued layout consistent. Use a searchable filename such as INV-1042-Acme-Ltd.pdf.
Common mistakes that make an invoice harder to pay
- Using a vague description. Name the supplied work, period or milestone clearly enough for the customer to approve it.
- Missing the supply date. GOV.UK lists the date the goods or service were provided separately from the invoice date.
- Treating payment details as the legal checklist. Bank details are useful, but they do not replace the required supplier, customer, date, description and amount fields.
- Copying an old invoice without checking it. Recheck the customer, VAT treatment, dates, numbering and totals every time.
- Sending to the wrong person. Ask whether the customer needs a purchase order or a specific accounts-payable inbox before the work begins.
Professional invoice and quote questions
How do I make a professional invoice?
Start with the required UK invoice details, then make the document easy to scan: label it as an invoice, keep the number and total prominent, itemise the work clearly, state a due date, explain how to pay, and check the final PDF before sending it to the correct accounts-payable contact.
What information must a UK invoice include?
GOV.UK lists a unique identification number, supplier and customer details, a clear description, supply and invoice dates, the amounts charged, VAT where applicable, and the total owed. Sole traders, limited companies and VAT-registered businesses have additional identity or VAT requirements.
What is the difference between a quote and an invoice?
A quote sets out proposed scope, price and terms before work is agreed. An invoice requests payment for goods or services supplied, or for an agreed milestone. Keep the accepted quote and any approved changes so the invoice can be checked against them.
Do quotes and invoices need separate numbering?
Separate prefixes such as QUO- and INV- make records easier to follow. GOV.UK requires every invoice to have a unique identification number, while VAT invoices require a unique sequential number from one or more series. Quote numbering is useful record-keeping, but it is separate from those invoice rules.
Can I turn a quote into an invoice?
Yes. A quote-to-invoice workflow can carry the customer, line items and prices into a new invoice. Review the supply date, due date, VAT treatment, invoice number and any agreed scope changes before issuing it.
Ready to create a clear invoice?
Start in the browser with the free invoice generator, or create an Experi account to keep quotes, invoices and payment status together.